diff --git a/src/mem/alloc.h b/src/mem/alloc.h
index b238bc2..b568cbc 100644
--- a/src/mem/alloc.h
+++ b/src/mem/alloc.h
@@ -733,12 +733,6 @@ namespace snmalloc
         size_t size1 = sizeclass_to_size(sc1);
         size_t size2 = sizeclass_to_size(sc2);
 
-        // All medium size classes are page aligned.
-        if (i > NUM_SMALL_CLASSES)
-        {
-          SNMALLOC_ASSERT(is_aligned_block<OS_PAGE_SIZE>(nullptr, size1));
-        }
-
         SNMALLOC_ASSERT(sc1 == i);
         SNMALLOC_ASSERT(sc1 == sc2);
         SNMALLOC_ASSERT(size1 == size);
diff --git a/src/mem/mediumslab.h b/src/mem/mediumslab.h
index d7632d5..59a10f2 100644
--- a/src/mem/mediumslab.h
+++ b/src/mem/mediumslab.h
@@ -85,11 +85,10 @@ namespace snmalloc
       void* p = pointer_offset(this, (static_cast<size_t>(index) << 8));
       free--;
 
-      SNMALLOC_ASSERT(is_aligned_block<OS_PAGE_SIZE>(p, OS_PAGE_SIZE));
-      size = bits::align_up(size, OS_PAGE_SIZE);
-
       if constexpr (zero_mem == YesZero)
-        memory_provider.template zero<true>(p, size);
+        memory_provider.zero(p, size);
+      else
+        UNUSED(size);
 
       return p;
     }